Improvement in plows



QS. HULBERT.

Plow. l

Patented Sept. 20, 1853.

UNITED STATES SAMUEL HULBERT, OF OGDENSBURG, NEW YORK.

IMPROVEMENT IN PLows.

Specification forming part of Letters Patent No. 10,031, dated September20, 1853.

To all whom it may concern:

Beit known that I, SAMUEL HULBEET, of the village of Ogdensburg, countyof St. Lawrence, State of New York, have invented various Improvementsin Agricultural Plows; and I do hereby declare that the following is afull and exact description of the same.

rIhe nature of my invention consists in constructing the working side ofthe mold-board of a plow uniformly convex from front to rear, and alsoconvex from top to bottom, so that a concave are ot' a circle, whenapplied to the mold-board horizontally, will lit in every part, and aconcave are ot' acircle7 when applied vertically to the line ot' thebasi'7 shall also adapt itself to every part of the said mold-board, themold-board being so curved as to turn the furrow-slice.

The advantages gained in the use of such a mold-board are, first, theplow is capable of cutting deeper than other plows which are constructedupon the concave or hollow shape, without being under the necessity ofincreasing the width of the plow. The front edge, or that part of themold-board and the point, runs Very obliquely upward and backward andextends back from the cutting-point some six inches more than s usual inother plows,whieh gives the plow an advantage of keeping in or of notbeing1 so easily thrown out of the ground by stones, and also the upperpart of the moldboard ofteisno more resistance to the furrow thananyother part ofthe same. Consequently the shape ot' the furrow is notaltered or rubbed oft' by any abruptness in the upper part of themold-board. rlhe piow is also thereby better adapted to various kinds ofplowing-for stubble. sod, and subsoil.

The second advantage is the uniform couvex shape from or near the rstcutting-point. Continuing the same throughout to the end of themoldboard, eft'ectually prevents the adhesion ofthe earth to it.

For a better description of which reference is had to the accompanyingdrawing.

A A is a base line. rlhen on applying a concave are of a circle at A A BB C C, and so on vertically or cross-sectionally to the base A A', theare will adapt itself in every part to the mold-board, and that aconcave are when applied horizontally at a a b b c c, and so on, shallalso adapt itself' to every part of the mold-board.

W'hat Iclaim as my invention, and desire to secure by Letters Patent,is-

Constructing a mold-board of a plow so that a horizontal line drawn atany height across its working side shall describe the convex are of agiven circle, and any line drawn across its working side at right anglesto the base shall also describe the convex are oi' a circle,substantially as set forth,

SAML. HULBERT. itnesses i rS. H. PLA'rT,

IsAAo N. GoEFiN.

